In Hong Kong, Batman captures Lau and makes his escape with a skyhook and delivers him to the Gotham City police where Lau agrees to testify, allowing Dent and Gordon arrest the mob. In retaliation, the Joker issues an ultimatum to Gotham that people will die each day unless Batman reveals his identity, resulting in the deaths of Commissioner Gillian B. Loeb and the judge presiding over the mob trials. Gordon foils Joker's assassination attempt on the mayor, apparently dying in the process. As a result, Bruce Wayne plans to reveal his identity as Batman, but Dent instead reveals himself as Batman to protect the truth and is taken into protective custody. Escorted across the city, Dent is pursued by the Joker while Batman rushes to his aid. Gordon, who faked his death to lure the Joker, arrests him with Batman's help and is promoted to Commissioner. However, Dent goes missing and the Joker reveals that both Dent and Rachel have been taken to separate buildings on opposite sides of town which will explode at the same time. Batman goes after Rachel, while Gordon and the police go to rescue Dent. At the same time, the Joker escapes custody with Lau using a smuggled bomb. Batman finds Dent and rescues him, even as Dent begs him to save Rachel instead. The buildings explode; Rachel is killed, while half of Dent's face is burned in the explosion, leaving him disfigured.
After killing Lau and the Chechen, the Joker threatens to destroy a hospital if Coleman Reese, an accountant at Wayne Enterprises who has deduced Batman's identity, is not dead within an hour. Bruce saves Reese, while the Joker visits Dent in the hospital and convinces him to take revenge against those who played a part in Rachel's death. The Joker blows up the hospital and leaves with a bus full of hostages, while Dent—now calling himself "Two-Face"—confronts and kills Maroni and the two corrupt cops who gave him and Rachel to the mob.
That night, as civilians are evacuated from the city, the Joker has two ferries rigged with explosives, offering both civilian and prisoner passenger groups a chance to live if they destroy the other boat. Batman asks his confidant Lucius Fox to find the Joker using a signal tracking device that will effectively spy on the entire city; Fox reluctantly agrees, but says he will resign from Wayne Enterprises immediately afterward. After discovering the Joker's location, Batman stops Gordon's SWAT teams from taking out the Joker, in order to protect the hostages and to capture the Joker himself. The ferry passengers ultimately refuse to kill one another, and Batman apprehends the Joker, who nevertheless says that he has won "the battle for Gotham's soul"; he reveals what he has done to Dent, stating that the citizens of Gotham will lose its newly found hope once Dent's rampage becomes public knowledge.
At the remains of the building where Rachel died, Batman finds Two-Face holding Gordon and his family at gunpoint. Two-Face judges the fate of Batman, himself, and Gordon's son with three flips of his lucky coin. As the result of the first two flips, he shoots Batman in the abdomen and spares himself. As Two-Face flips the coin to determine the boy's fate, Batman (who is wearing body armor) tackles him over the side of the building, killing him. Batman convinces Gordon to hold him publicly responsible for the murders; moments later, the police swarm the building, and a manhunt for Batman ensues. Batman retreats on the Batpod, now a fugitive. Gordon later delivers the eulogy at Dent's funeral and smashes the Bat-Signal, while Fox watches the signal-tracking device self-destruct and Alfred Pennyworth destroys a letter written by Rachel revealing her plans to marry Dent.
source : wikipedia
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